More Signs Birds Affected by Climate Change
Interestingly, this study also finds that long-distance migrants don’t migrate earlier. They aren’t able to use local climate cues to time their migration departure in the same way that shorter-distance migrants do. As a result, birds that winter in South America may face conditions along their migration route and on their breeding grounds which are far less than optimal, particularly in warm years. It’s not a pretty picture to imagine the all too plausible scenario of our boreal warblers returning to their breeding grounds only to have missed the massive pulse of insects on which they depend.